Aikido without the kicks and WITH a lot of very sharp techniques and a LOT of serious nerve pain. I don't know how the hapkido guys take the applications I've seen.
hapkido, if you can find it, is ubber-fun for learning how to fight, to play in MMA, and for self-defense, but in hapkido, after many years, we must eventually decided on a "base" to specialize into, after getting exposed to all its varied ways.
aikido is fun, learning non-load bearing throws, utemi, and take-downs.
and all of aikido can "fit" into hapkido, IMHO.